Abstract: Some embodiments implement a method for an electronic feedback loop based on data generated by at least one bike power sensor. The method can include generating, by an exertion sensor data processor based on the one or more electronic files, data indicating training phases for a race season, wherein each of the training phases define swim workouts, bike workouts, and run workouts. The method can also include receiving, by the exertion sensor data processor via the electronic network, an electronic exertion data file indicating power output detected by the bike power sensor. The method can also include modifying, by the exertion sensor data processor, at least one of the swim workouts, bike workouts, or run workouts based on the power output detected by the bike power sensor.